Looper mechanism for sewing-machines.



L. E. JOHNSON & E. ERlCKSON.

LOOPER MECHANISM FOR SEWING MACHINES.

APPLICATION FILED APR. 24, I914. RENEWED FEB. 18. 1915.

1,154,571. PatentedSept. 21, 1915.

l'mEJeimsan, Edwardrwksom COLUMBIA PLANOGRAPH CD.,\VASHINGTON. u. c.

nnrran s'ra'rns earner oriuon- LAWRENCE E. JOHNSON, orwINrrmor, AND EDWARD nnIoKsON, or LYNN, MASSA- onusnr'rs, ASSIGNORS T0 vrcroe SHOE MACHINERY 00,01? BOSTON, MASSACHU- "SETTS, A CORPORATION or MASSACHUSETTS.

LOOPER MECHANISM FOR SEWING-MACHINES. v

Patented Sept. 21, 1915.

Application filed April 2 1, 1914, Serial No. 834,528. Renewed February 18,1915. Serial No. 9,211.

loopers for shoe sewing machines and in the mechanisms for operating the same, the object of the invention being to produce a more effectlve mechanlsm and at the same tune simplify the construction of these devices by reducing the number of parts to a minimum.

The: invention consists in certain novel features of construction and arrangement of parts which will be fully understood by reference to the description of the parts and to the claims hereinafter given. 7

Of the drawings: Figure 1 represents a vertical section of a sewing machine embodying the principles of the present invention, and Fig. 2 represents a sectional detail of the mechanism for operating thelooper.

Similar characters designate like parts throughout the drawings.

In the drawings, 20 is the frame of the machine having revolubly mounted therein the shaft 21. The shaft 21 has keyed thereto a cam disk 22 having a peripheral cam path 23 with a throw 24 therein adapted to move the roller 25,- positioned therein, in a direction parallel to said shaft21. The cam disk 22 is also provided with peripheral cam throws 26 on both sides of said cam path 23,

these throws 26 being adapted to move the rollers 27 outwardly away from the shaft 21. The rollers 27 are in alinement and revolubly mounted on a block 28 on which the roller 25 is also revolubly mounted perpen- -dicula-r to the axis of the rollers 27. The

lel fiat faces between which is positioned the flat sided end 35 of an oscillating member 36 extending through the end frame 37 and having secured to its outer end the arm 38, between the outer end of which and a fixed eye 39 is interposed a spring 40, the object of which is to retain the rollers 27 in contact with the periphery of the cam disk 22 under all conditions. i

To insure the best results, two alined rollers 27 are essential, and both of these must be retained constantly in contact with the periphery of the cam disk 22. If the rollerswear unevenly or the periphery of the cam disk 22 wears unevenly on opposite sides of. the cam path 23, an imperfect result would occur unless some provision is made whereby contact of the rollers with the cam surfaces is assured under varying conditions. This is accomplishedby mounting the rollers 2527 on a block pivotally connected to the looper support so that when the cam or rollers become unevenly worn the block .is free to turn about the axis of the pivotal member 29 so that said rollers 27 may ac-;

commodate themselves to the changed conditions. To prevent the cramping of the roller 25 in the cam path 23 when the block 28 is moved about the axis of the pivot member parted to oscillate it about the axis of the pin 36 and when the throws 26 operate on the rollers 27, said support 31 will be moved about the axis of the member 36, the combined movements causing the looper 33 to be moved in anorbit. Itis self-evident that owing to the pivotal connection of the looper support 31, whereby it may be tilted in either direction by the cam throws 24:26, the looper will have imparted to it an orbital movement in a path encircling that in which the needle 40 moves, the cams being so constructed and timed that this movement will occur when the needle has passed through the work and lies within the orbit of the looper.

This makes a very simple construction of looper mechanism which is very effective in operation.

The other parts of the sewing machine form no part of the present invention, and are therefore not herein described. The machine shown in the drawings is the same as that fully shown and described in another application of ours filed May 19, 1913, and

numbered 768,671, to which reference may be made for a complete description of its operation.

It is believed that the operation and many advantages of this invention will be fully understood from the foregoing description.

.Having thus described our invention, we claim:

1. In a shoesewing machine, the combination with a looper; of a support therefor adapted to be tilted in curved paths the planes of which are perpendicular to each other and consisting of two arms angularly" disposed relatively to each other, one of said arms being provided with a substantially vertical cylindrical boss at the end thereof; a block provided with a pivot member positioned in said cylindrical boss; two alined rollers on opposite sides of said block; another roller on an intermediate face of said block; and a revoluble member having a peripheral cam path acting upon the intermediate roller and peripheral cams acting upon said alined rollers.

2. In a shoe-sewing machine, the combination with a looper; of a support therefor adapted to be tilted in curved paths the planes of which are perpendicular to each other and provided with a rearwardly extending arm; a block pivotally mounted tion with a looper; of a support therefor adapted to be tilted in curved paths, the

Gqpies of this'patent may be obtained for planes of which are perpendicular to each other and provided with a rearwardly extending arm; a block pivotally mounted upon said arm with its pivot extending transversely of said arm and in the same vertical plane therewith; a revoluble member having a cam provided with a peripheral cam path and a peripheral cam throw; and rollers mounted on said block and coacting with said cam path and throw, the

roller in said cam path having a curved periphery.

4. In a shoe-sewing machine, the combination with a looper; of a two-part support therefor connected togetherby a horizontal pin and adapted to be tilted in curved paths the planes of which are perpendicular to each other, said support being provided with a rearwardly extending arm; a block pivotally mounted upon saidarm with its pivot in the same plane with and at an angle to said pin; a revoluble member having a cam provided with a peripheral cam path and a peripheral cam throw; and rollers mounted on said block and coacting with said cam path and throw to move said looper in an orbit.

5. In a shoe-sewing machine, the combination with a looper; of a bifurcated support therefor; an oscillating member having a flattened end'positioned in said bifurcated support and connected theretoby a pivot pin perpendicular to the axis of said support; a block'provided with a pivotal. shank positioned in said support in the same vertical plane with said pivot pin but at an angle thereto; rollers on said block perpendicular to each other; and cam members coacting with said rollers for simultaneously moving said support about its pivot and said oscillating member about its axis.

Signed by us at Boston, Mass, this 14th day of April, 1914.

LAWRENCE E. JOHNSON. I EDWARD ERICKSON.

Witnesses WALTER E. LoMnAnD, NATHAN C. LOMBARI).

five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

